Regulating transformer



June 3, 1930. G. BURNENGO .REGULATING TRANSFORMER Filed May 3, 1926 Are 19 .18

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" Patented June 35.1930

GIUSEIPPE BURNENGO, OF GENOA ITALY 'nneurnrme 'rnnivsronr nn Application filed May 3, 1926, Serial No. 196,526, and in Italy May .5, 19 25.

The present inventionrelates to improvements in and relating to static transformers of the type which are regulated through the motion of a member of magnetic material,

said motion producing -a variation of the quantity of magnetic flux linking with windings of the circuits, thus obtaining a regulation of the "transformer. The present invention more particularly consists in the arrangement of the windings on the windings.

ln the accompanying drawings are-shown by way of example various forms of the 1nvention.

Fig. 1 shows schematically one form of position on a core in Fig. 2; 1

Figs. 3 and 4 show other connections of the windings of Fig. 2;

- Figs. 5 and 6 show two courses of the magnetic flux in accordance with the positions of the movable magnetic member of the 'device shown in Fig. :7;

Fig. 8 shows a further arrangement of cores and windings; and

Figs. 9, 10 and 11 show respectively a side elevation, end elevation and plan of a practical embodiment of the invention.

The present invention provides means whereby the impedance of reactance coils .may be varied and whereby the mutual in ductance between the various coils of auto and other transformers may be adjusted in accordance with well-known requirements.

Referring particularly to Fig. 1, there is shown a set of windings connected in series in which the current may be supplied between the pointsll and 12 while the desired working current is taken from the points 11 and 13'or vice versa. Each of the windings 14, 15, 16 and 17 is wound winding arrangement which is shown in in a direction corresponding to the direction of one of the windings 18, 19, 20 and 21. The latter windings are suitably interposed between the former as shown. in Fig. 2. Both the primary and the secondary windings are composed of four coils, two with more turns than the other two and arranged in such a manner that the two spools of the primary windings with the more turns are in direct inductive relation to the spools of the secondary with the less turns and vice versa, in order that there may be less voltage drop in the secondary. The movable shunt member 22 is shown as transversely movable between the coil-receiving legs of a closed magnetic core.

The two primary windings with more turns induce more flux in thesecondary sections consisting of a less numberof turns of small wire. The larger number. or" turns of thin wire are arranged in inductive relation to the primary windings of a small number of turns as, for instance, at the right hand of Fig. 2 in order to allow of the obtaining, in

the secondary working circuit, of a compensated flux and a compensator flux. The

auto transformer is reversible in its operations, i. e., it may be supplied with a low voltage and a high voltage drawn therefrom, or vice versa. If, instead of arranging the windings as shown in Fig. 3, they are connected as shown in Fig. 4, a transformer for raising or lowering the voltage is obtained.

Figs. 5 and fi-show the two extreme conditions of the magnetic flux in the core.. First, when the movable member of the core is completely inserted and second, when it is completely removed. In the first case, the voltage in the secondary is of a minimum value but never zero. In the second case, parallel lines of flux flow through the movable member 22 and are of the same amount. This results in a diminution of the resistance in all of the windings whereby the voltages of the secondary will increase in accordance with the ratio of the turns.

Fig: 7 shows schematically the arrangement of the core of Fig. 2 with the movable member 22 between the parts 23 and 24 the block In but is prevented from longitudi-" of the core, while in Fig. 8 the movable member is shown as divided into two parts, 22 and 22", which may have similar or dissimilar movements in respect to each other, so that theproportions of the induced voltages in the various windings can be adjusted to suit various external conditions.

A practical embodiment of the invention is shown in Figs. 9, 10 and 11, wherein a a represents the coil receiving legs of a closed circuitcore of which I) b are the end mem-' bers. 'The windings are shown at c, d, e, and f. Each winding is composed of two vcoils such as has been explained in connection with Fig. Between theinner surfaces g and h of the core legs there is arrangechfor longitudinal movement, a core member is through which passes a screw threaded rod 71 provided at one end with ahandwheel Z. The rod is threaded into a member on rigidly supported by the core and moves freely in nal movement therein by means of suitable washers. lhus, by rotating the rod by means of the hand wheel, the block may be moved from the position shown in full lines in Fig. 10, where itis between the core legs,

' to a position where it is completely removed from between these parts of the core. is displaced in the direction of the arrow m when being drawn between the core parts. hen in the closed position the hand wheel assumes the position indicated by dotted lines at Z. Binding posts for the various windings are indicated at 0. t;

I claim:

A variable static transformer comprising a core having a pair of-parallel legs, a movable magnetic member disposed between said parallel legs, a primary winding and a secondary winding on each leg, each winding on each leg comprising a major section and a minorsection, the major and minor sections of each winding being arranged in close inductive relation to the minor and ma'or sections res ectivel of the other winding.

In testimony whereofl afiix my signature. 'GlUSEPPE BURNENGO.

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